Method and apparatus for detecting thickness variation in sheet

Details Method and apparatus for detecting thickness variation in sheet Method and apparatus for detecting thickness variation in sheet

1992-12-11

1994-06-07

Williams, Hezron E.

Measuring and testing

With fluid pressure

Dimension, shape, or size

73 37, G01B 1304

Patent

active

053178980

ABSTRACT:
The detection of thickness variations in sheet material, more specifically the presence or absence of labels on a moving web, is accomplished by providing two spaced apart nozzles, an entry for pressurized fluid, first and second conduits to connect the entry and the nozzles, and a differential pressure sensing element connected between the conduits so as to detect a mismatch between the fluid pressures in the two conduits.

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